The R-factor

Patented * R-Core® insulation, U.S. Patent Number 4,516,356

The R-factor (insulation value) per linear inch of our UniFrame window frame is seven times greater than that of an ordinary vinyl frame. The secret is our patented R-Core® insulation — a high-density solid polyurethane insulation like the kind used in many refrigerator and freezer doors. And, we pre-expand it so there are no voids or settling, giving it optimum insulating power and sound deadening properties.